Journal of Ecophysiology and Occupational Health

V. M. Lagade ¹, D. V. Muley ²

Affiliations
1 Department of Zoology, Shri Yashwantrao Patil Science Mahavidyalaya, Solankur, Kolhapur, Maharashtra-416 211., IN
2 Department of Zoology, Shivaji University, Kolhapur, Maharashtra-416 004, IN

Abstract

In the present investigation, the physiological body indices like hepatopancreas index (HI), gonadal index (GI) and condition index (CI) of two estuarine clams (Katelysiaopima and Meretrixmeretrix) were estimated after exposing to three experimental temperatures (20, 25 and 35°C). In experimental design, both the clam species were exposed to selected temperatures for 192 hours (8 days) and during the exposures the body indices were determined at each 48 hours of interval. After exposing to experimental temperatures, in both the clams, all body indices like HI, GI and CI were considerably declined (p<0.001) after 192 hours of exposure. The highest decline in body indices has been noted particularly at high temperature (35°C) followed by low temperature like 20°C and 25°C. On the basis of obtained results, it confirms that, the gonadal index was closely related to hepatopancreas index and increment of condition index is directly associated with gonadal development. Relatively, M. meretrix species was more sensitive towards temperature change and it has been evident from the maximum decline in body indices than K. opima. Hence, the quantitative analysis of body indices among clams might be useful in assessing the probable effect of short-term change in water temperature on physiological process.

Keywords

Physiological Body Indices, Clams, Hepatopancreas, Temperature.

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S. S. Taware ¹, D. V. Muley ¹

Affiliations
1 Department of Zoology, Shivaji university, Kolhapur - 416 004 (M.S.), IN

Abstract

The physiological response of estuarine clam Katelysia opima under osmotic stress was studied by exposing average sized clams (30 to 35 mm) to various lower salinity ranges (control to 10% salinity) for the period of 8 days. Level of biochemical constituents (protein, lipid and glycogen) in selected tissues (hepatopancreas, gonad, foot and gill) after completion of 8 days exposure period were studied and taken as a measure of physiological alterations in osmotic stress. Biochemical alteration in the clam after exposure to lower salinity ranges were distinctly observed below 70% salinity range, where biochemical constituents significantly reduced in both reproductive and somatic tissues but with variation in range of reduction.

Keywords

Salinity, Katelysia Opima, Physiological Responses, Biochemical Alterations.

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